This file is used to register sending and receiving applications for HL7
order for an application to receive messages, it must specify an action
(M tag^routine) for each type of message that it is capable of receiving, or a
default action that applies when no messsage-specific action is defined.
messaging. For receiving applications, the process of registration consists of
registering what messages the application is prepared to receive.
For both sending and receiving applications, it is necessary to specify
what package the application belongs to. For sending applications, that is
the only field that applies, other than the name of the sending application.
An application can be either a sender or a receiver of messages, or both. In